$sql = "set @rank :=0, @pos :=0, @game := NULL, @score := NULL;
	UPDATE `af_score_ranked`
	SET `rank_in_game` =
	greatest(
		@rank := if( @score = `score`, @rank , @rank +1 )							least( 0, @score := `score` )
		) ORDER BY `score` DESC" or die(myMysqlError($sql, mysql_error(), __LINE__, __FILE__));